A blind disk is officially called a Flange cover, and some are also called blind flanges or pipe plugs. It is the Flange with no hole in the middle, used to plug the pipe mouth.
The function is the same as that of the head and cap, except that the blind seal is a detachable seal, and the seal of the head is not intended to be opened. There are many types of sealing surface, including plane, convex surface, concave-convex surface, tongue and groove surface and ring connection surface. Materials are carbon steel, stainless steel, alloy steel, copper, aluminum, PVC and PPR, and so on.
